Property Improvement in Light Metals Using Shot Peening

Author:  Gregory, Wagner
Source:  Conf Proc: ICSP-8 Sept. 16-20, 2002 Garmisch-Partenkirchen, Germany
Doc ID:  2002045
Year of Publication:  2002
Authors Jean K. Gregory1) and Lothar Wagner 2) 1)Springfield Metallurgical Services, Inc., Springfield, VT, USA 2)Chair of Physical Metallurgy and Materials Technology, Technical University of Brandenburg at Cottbus, Cottbus, Germany Abstract The goal of this overview is to outline potential improvements in fatigue performance of light metals by shot peening. The overview is aimed at correlating the process-induced changes in surface layer properties (e.g., roughness, near-surface depth profiles of dislocation densities and residual stresses) of titanium, aluminum and magnesium based alloys with the changes in resistances to fatigue crack nucleation and microcrack propagation. Characteristic examples are presented for each alloy system including a, (a+B), metastable B titanium alloys and titanium aluminides, aluminum alloys with various age-hardening conditions as well as magnesium alloys. Depending on the alloy system, shot peening-affected surface layer properties such as process-induced damage, work-hardening and residual stresses and their cyclic stability were found to be the main parameters in affecting fatigue performance of light-weight alloys.

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